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Motor control apparatus and motor control method

a motor control and control apparatus technology, applied in the direction of motor/generator/converter stopper, dynamo-electric converter control, pulse technique, etc., can solve the problem of the deviation of the output of the resolver, and the inability to control the output of the motor

Active Publication Date: 2006-05-09
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]The correction means may correct the output of the rotational position sensor considering a change in a voltage phase command that decides a period during which a voltage is applied to each phase of the motor when the voltage phase command is changed.
[0013]The correction means may correct the output of the rotational position sensor considering a change in a rotational speed of the rotor when the rotational speed is changed.
[0014]The correction means may correct the output of the rotational position sensor considering a change in a voltage phase command that decides a period during which a voltage is applied to each phase of the motor and a change in a rotational speed of the rotor.
[0015]The correction means may correct the output of the rotational position sensor considering a change in a rotational speed of the rotor by using a time required for rotating the rotor one time in a previous control cycle and a time required for rotating the rotor one time in a present control cycle.
[0019]Thus, according to the invention, even when the output of the rotational position sensor has a deviation, a failure of the motor control can be prevented so that the motor can be driven. Also, even when the voltage phase command for each phase of the motor or the rotational speed of the motor is changed, a failure of the motor control can be prevented so that the motor can be driven.

Problems solved by technology

However, since a deviation of the output of the resolver such as a 0.5th-order deviation and a first-order deviation generally occurs, the rotational angle output from the resolver is not linearly increased with time.
Also, a change in the rotational speed of the rotor may be caused, which may cause the deviation of the output of the resolver.
However, the Japanese Patent Laid-Open Publication No. 2001-165707 does not disclose a motor control using the output of the resolver which is corrected using the rotational speed of the rotor.
Therefore, the motor control has not been improved.

Method used

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  • Motor control apparatus and motor control method
  • Motor control apparatus and motor control method
  • Motor control apparatus and motor control method

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first embodiment

[0044][First Embodiment]

[0045]As shown in FIG. 1, a motor control apparatus 100 according to a first embodiment of the invention includes a DC power source B, inverters 10, 20, a capacitor 30, resolvers 40, 50, electric current sensors 60, 70, and a control device 80.

[0046]The inverter 10 includes a U-phase arm 11, a V-phase arm 12, and a W-phase arm 13. The U-phase arm 11, the V-phase arm 12, and the W-phase arm 13 are connected in parallel between a node N1 and a node N2.

[0047]The U-phase arm 11 includes NPN transistors Q3, Q4 that are connected in series. The V-phase arm 12 includes NPN transistors Q5, Q6 that are connected in series. The W-phase arm 13 includes NPN transistors Q7, Q8 that are connected in series. Each of diodes D3 to D8 for causing an electric current to flow from an emitter side to a collector side is connected to a portion between a collector and an emitter in each of the NPN transistors Q3 to Q8.

[0048]The inverter 20 includes a U-phase arm 21, a V-phase arm 2...

second embodiment

[0095][Second Embodiment]

[0096]As shown in FIG. 7, the configuration of a motor control apparatus 100A according to a second embodiment of the invention is the same as that of the control apparatus 100 according to the first embodiment of the invention, except that a control device 80A is used instead of the control device 80.

[0097]As shown in FIG. 8, the control device 80A includes an angle correction portion 81A instead of the angle correction portion 81 of the control device 80.

[0098]The angle correction portion 81A corrects each of the rotational angles θbn1, θbn2 output from each of the resolvers 40, 50 considering a change in the voltage phase command for each phase of each of the AC motors M1, M2. That is, the angle correction portion 81A corrects the rotational angle θbn based on the rotational angle θbn1 (or the rotational angle θbn2) output from the resolver 40 (or the resolver 50) and the voltage phase command values Vu1, Vv1, Vw1 (or the voltage phase command values Vu2,...

third embodiment

[0109][Third Embodiment]

[0110]As shown in FIG. 11, a motor control apparatus 100B according to a third embodiment of the invention is the same as the motor control apparatus 100, except that a control device 80B is used instead of the control device 80 of the motor control apparatus 100.

[0111]As shown in FIG. 12, the control device 80B includes an angle correction portion 81B instead of the angle correction portion 81 of the control device 80.

[0112]The angle correction portion 81B corrects the rotational angles at the intervals of 60 degrees considering a change in the rotational speed of each of the resolver 40 and the resolver 50. As shown in FIG. 13, when the rotational speed is not changed, the rotational angle θbn (θbn1 or θbn2) is linearly increased with time along a straight line k3. However, when the rotational speed is changed, the rotational angle θbn is not linearly increased with respect to time, as shown by a curved line k4.

[0113]In the invention, in the case where a ro...

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PUM

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Abstract

A control device measures time intervals T1 to T12 from the reference time until when each of the rotational angles θbn1, θbn2 output from each of resolvers becomes n×60 degrees (n=1 to 12, i.e., 60 degrees to 720 degrees). Then, the control device calculates a deviation angle Δθn at each of the rotational angles at the intervals of 60 degrees by calculating T1 / T12 to T11 / T12 using the measured T1 to T12. By substituting the calculated deviation angle Δθn into an equation, n×60°+Δθn (n=1 to 11), the control device corrects the rotational angles at the intervals of 60 degrees. The control device generates each of drive signals DRV1, DRV2 using each of the corrected rotational angles, and outputs each of the drive signals DRV1, DRV2 to each of inverters. The inverters drive each of AC motors (M1, M2) based on each of the drive signals DRV1, DRV2.

Description

INCORPORATION BY REFERENCE[0001]The disclosure of Japanese Patent Application No. 2003-8401 filed on Jan. 16, 2003, including the specification, drawings and abstract is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a motor control apparatus and a motor control method which control a motor by correcting an output of a resolver.[0004]2. Description of the Related Art[0005]In order to continuously rotate a rotor of a motor using a rotating magnetic field, the rotational position of the rotor is detected. The rotational position of the rotor is detected using a resolver fitted to a rotating shaft.[0006]In other words, the resolver detects the rotational position of the rotor which is rotated, and outputs a position signal corresponding to each rotational position of the rotor as an analogue signal. A central processing unit (hereinafter, referred to as CPU) of a computer converts the analogue si...

Claims

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Application Information

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IPC IPC(8): H03K5/00H02P3/18H02P5/52H02P27/06H02P5/74H02P21/00H02P21/14H02P21/18H02P21/22H02P21/24H02P21/28H02P23/14H02P27/04H02P27/08
CPCH02P5/74H02P5/526H02P5/56H02P6/14
Inventor YAGUCHI, HIDEAKIYOKOYAMA, SOJIRO
Owner DENSO CORP